What are the symptoms and causes of motorcycle misfiring?

[JudeAnn]

Motorcycle misfiring symptoms and causes are as follows: 1. Symptoms: At idle speed, the vehicle body shakes noticeably. Observing the exhaust pipe outlet, the exhaust gas flow exhibits obvious intermittency, accompanied by severe exhaust pipe vibration, and distinct "popping" or "thumping" sounds can be clearly heard. The main manifestations of misfiring include severe engine vibration, as one or more cylinders fail to operate. Firstly, the engine's balance is disrupted - when the crankshaft reaches the point where a cylinder should generate combustion force, the absence of this force causes RPM to drop. When the next cylinder combusts and provides thrust, RPM rises, resulting in unstable rotation speed and engine vibration. 2. Causes: The most common cause of motorcycle misfiring is spark plug failure - damaged spark plugs cannot ignite, preventing cylinder combustion and leading to misfiring. Another possible cause is fuel injector malfunction; failure to spray fuel or poor fuel atomization can also result in abnormal combustion and misfiring.